<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
   <button>点我试试</button>
</body>
</html>
<script>
    // var btn=document.querySelector("button")
    // var timer=null
    // btn.onclick=function(){
    //     clearTimeout(timer)
    //     timer=setTimeout(()=>{
    //         console.log("发送请求了");
    //     },2000)
    // }


    var btn=document.querySelector("button")
    var timer=null
    btn.onclick=function(){
        clearTimeout(timer)
        timer=setTimeout(()=>{
            console.log("发送请求了");
        },2000)
    }
</script>